Evidence of surging usage for new OpenAI models and sustained growth from Google has triggered a significant repricing in prediction markets for DeepSeek's weekly market share. In the session on Monday, October 08, 2026, contracts on the Kalshi exchange saw a broad-based decline, signaling that traders are scaling back expectations for the AI lab's near-term growth on the OpenRouter platform.
The sharpest move occurred in the contract for DeepSeek's share to finish "Above 23.4%" for the week of October 5. Its implied probability plunged 53 percentage points from 76% to just 12% on high volume. The repricing reflects a broader shift across the market, as eight of nine related contracts fell, suggesting traders now anticipate a more constrained performance for DeepSeek amidst intensifying competition. The last official weekly data from OpenRouter showed DeepSeek leading at 21.8%, making the previous 76% odds for a result above 23.4% appear overly optimistic in light of new competitive data.
Distribution Analysis
The market's implied probabilities shifted significantly lower across most outcomes. The highest-volume contracts saw the largest declines, indicating strong conviction behind the move. The probability mass, once concentrated on outcomes well above 23%, has now coalesced in a range between 22.2% and 22.9%.
| Outcome | Current Prob | Change | Volume |
|---|---|---|---|
| Above 20.0% | 99% | +2.0pp | 4,285 |
| Above 21.3% | 98% | -3.0pp | 3,302 |
| Above 22.2% | 94% | -16.0pp | 25,892 |
| Above 21.9% | 90% | -5.0pp | 4,481 |
| Above 22.6% | 84% | -27.0pp | 34,469 |
| Above 22.4% | 81% | -30.0pp | 36,103 |
| Above 22.9% | 41% | -13.0pp | 8,367 |
| Above 23.4% | 12% | -53.0pp | 78,059 |
| Above 24.6% | 2% | -30.0pp | 1,411 |
Net: 8 of 9 contracts declined on 192,085 total volume, shifting the implied consensus for DeepSeek's market share lower.
What's Driving the Shift
The repricing appears to be driven by new data indicating that DeepSeek's primary competitors are gaining significant ground.
New OpenAI Model Surge: The most recent data from OpenRouter, the market's settlement source, shows new OpenAI models gaining exponential traction. Models including GPT-6.1 Sol and GPT-6.1 Sol Pro are listed in the "New & Trending" category with week-over-week usage growth of over 999%. This rapid adoption of new, powerful models from the industry leader represents a direct competitive threat to incumbent models from DeepSeek and others.
Sustained Competitor Momentum: The latest complete weekly report from OpenRouter, for the week beginning September 28, showed DeepSeek's request volume grew 5%. While positive, this was significantly outpaced by 23% growth for Google and 20% for OpenAI. This faster growth from its two largest rivals suggests DeepSeek's market share lead is under pressure.
Re-Anchoring to Fundamentals: DeepSeek's last reported weekly share of text requests was 21.8%. The previous market pricing implied a high probability of the company gaining nearly two percentage points of share in a single week. The recent sell-off brings expectations closer to the last known data point, pricing in a more modest growth trajectory.
Market Context
This prediction market is specific to market share on OpenRouter, an API routing service popular with developers that measures usage by text requests. While DeepSeek has been a leader on this platform, its overall share of the global consumer AI chatbot market is estimated to be below 1%, where services from OpenAI and Google hold a commanding lead.
Data from other prediction market venues shows a similar theme. A related market on Polymarket still prices DeepSeek as the 86.1% favorite to be the #1 lab for the week. However, the granular, multi-level structure of the Kalshi market allows traders to express more nuanced views on the magnitude of that lead, which is where the recent bearish sentiment has been most visible.
What to Watch
This market is scheduled to close on October 12, 2026. It will resolve to "Yes" for all outcomes where DeepSeek's share of text requests on OpenRouter, for the week beginning October 5, exceeds the specified threshold. The definitive data will be published on the OpenRouter rankings page. The market will remain sensitive to any new usage data or major model releases from DeepSeek or its key competitors in the coming days.
